Play your iPod or other portable music devices in full stereo through your car radio or home system without wires and cables!  The Sonic Impact SI-Link uses two AAA batteries (not included) and plugs into the headphone port of your iPod, MP3 player, CD player, cassette player, PDA, or laptop to transmit your music to your FM radio.  Frequency switch allows choice of FM frequency from 88 MHz to 89.5 MHz for best reception.  Smaller than a deck of cards.